How to use DongleUP.exe upgrade tool 1. Connect pc and box with rs232 line. 2. Open DongleUP.exe tool and press ¡°open¡± button to select correct file {BOOTLOADER} which you want to upgrade 3. Press power key and then power on box 4. When there is "H" blinked in front panel, press "start¡± button in DongleUP.exe tool, then upgrade start. 5. After successful upgrade, the box will reboot automatically.